Features:1. Supports bluetooth handsfree、 built in microphone、 safe and convenient to answer the call、 call when the noise processing of CVC、 wind noise supression.2. Supports A2DP function of mobile phone via Bluetooth directly high-quailty mobile phone music.(Bluetooth stereo)3. The power supply after opening、 automatic back to even、 automatic into the matching condition.4. Supports USB、 SD card、 support MP3/ WMA/FLAC music to format.5. Can charge for various intelligent mobile phone、 USB output 5V/ 500mA.6. Supports to connect the computer to download function、 can directly connected to the computer to download songs SD/ TF card.Using Bluetooth function:1. Using Bluetooth for the first、 you need to pair your mobile phone with this unit、 Activate your phones Bluetooth function、 then search new device.Press ¡°PLAY¡±button three seconds. When it display¡°PAIR¡±、 the mobile phone detects this unit(named as CAR KIT)、 Please pair and connect by using the original password "0000"2. In the music playing mode、 when there is an incoming call、 this unit will automatically switch to telephone modeA2DP function:1. With A2DP function mobile phones (some cellphone call music developing different version) can be in even after the bluetooth、 through the car hands-free car audio broadcast in mobile phone music.2. Priority level: the priority level is shown as follows when different functions are under working: Mobile call > A2DP play > U-disk music play/ SD card music playSpecifications:1. Roted voltage: 12~24V2. Power consumption: 0.5W3.  Frequecy response: 20Hz-15Khz4. Bluetooth audio process with A2DP function (Advance Audio Distribution Profile)5. Blutooth transmission distance: 10-15m6. FM emission frequency: 87.5~108MHz7. USB charging port: 5V/ 500mLPackage include1 x FM Transmitter1 x Steering wheel Controller1 x Remote Controller1 x User Manual1 X Audio Line Note: Red、 blue and white 3 colors available、 they will be sent at random、 pls in kind prevail.